title: [Study on the constancy of EEG characteristics in epileptic patients (author's transl)].
abstract: These investigations were based on the question regarding the reliability of a single EEG recording in patients with epilepsy. 114 patients patients (age 11-74 years, median 33 years) underwent five EEGs at an interval of three months during a period of one year. A "constant" characteristic was a continuously developed dysrhythmia. "Moderately constant" was an intermittent dysrhythmia, an alpha background activity and a general slowing of the background activity. "Inconstant" was a "parenrhythmia" and focal disturbances as well as epileptiform patterns. Similarly inconstant was the lateralization of epileptiform patterns. The lateralization of focal disturbances and a dysrhythmia was moderately constant. The great constancy of a continuously developed dysrhythmia makes it hardly suitable for a functional follow-up. The applications of epileptiform patterns and focal disturbances for therapy planning is, however, limited due to their inconstancy. Because of its moderate constancy the background activity (in different recordings) is a suitable indicator for an overdosage of antiepileptic drugs.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D004292:Dominance, Cerebral / Q000502:physiology; D004569:Electroencephalography / Q000379:methods*; D004832:Epilepsy, Absence / Q000175:diagnosis* / Q000503:physiopathology; D004833:Epilepsy, Temporal Lobe / Q000175:diagnosis* / Q000503:physiopathology; D004830:Epilepsy, Tonic-Clonic / Q000175:diagnosis* / Q000503:physiopathology; D005071:Evoked Potentials; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged
vernacular_title: Untersuchungen zur Konstanz von EEG-Merkmalen bei Epilepsie-Patienten.